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20121201
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of the answer is found in an elaborate system of irrigation, canals that helped the city produce a large agricultural surplus. although most remained farmers, irrigation freed some 30,000 to 40,000 people to pursue other jobs like making clay figurines. but it was not clay sculpture that transformed teotihuacan into an economic superpower. it was another material -- obsidian, a natural volcanic glass whose edge was as sharp as a razor. obsidian was the knife of the ancient world. 30 miles north of teotihuacan, archaeologists have discovered the major source of obsidian in a place called pachuca. this is alejandro pastna of the mexican institute of anthropology and history, and his colleague rafael cruz. they have come here to map the locations of ancient mines. let's go. [ glass crunching ] obsidian fragments litter the surface, the refuse of thousands of years of mining activity. the glass that formed here by nature was especially prized by the ancients because of a unique quality. interpreter: this obsidian was only formed in this deposit. most obsidian is black or gray, but the green
. there was a sharia court in the city. these are basically consider it. >> civilian councils are trying. civilian councils are trying to wrestle more and more control from the fsa. the relationship as cooperative. in large depends on whether or not it meet that. i was able to meet with the commanders. i met with the supporters. not 10[inaudible] are either criminals gangs trying to take care of the chaos or the small extreme group that is well funded. majority are severly under funded. i met to the brigade commander with not enough food to go around. there's also that aspect but who is funded and who is not. they're trying to portray themselves as the ones that are leading the fighting in aleppo. they immediately rejected the coalition. this was reported. i got in touch with the commanders. the main fighting group in a lot of but of a video. they do not represent us. they said we recognize the council. i think of them as moderates. even their experience and food shortages. this is very well funded. this logic depends on whether 0% can receive reports. >> right now and maybe the case that people i
Search Results 0 to 1 of about 2